import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Optional;
public
class Lambda1 {
public static
void main(String[] args) {
List<String> names = Arrays.asList(
"peter",
"anna",
"mike",
"xenia");
Collections.sort(names,
new Comparator<String>() {
@Override
public int compare(String a, String b) {
return b.compareTo(a);
}
});
Collections.sort
(names, (String a, String b) -> {
return b.compareTo(a);
});
Collections.sort(names, (String a, String b) -> b.compareTo(a));
Collections.sort(names, (a, b) -> b.compareTo(a));
System.out.println(names);
names.sort(Collections.reverseOrder());
System.out.println(names);
List<String> names2 = Arrays.asList("peter", null, "anna", "mike", "xenia");
names2.sort(Comparator.nullsLast(String::compareTo));
System.out.println(names2);
List<String> names3 = null;
Optional.ofNullable(names3).ifPresent(list -> list.sort(Comparator.naturalOrder()));
System.out.println(names3);
}
}
转载于:https://www.cnblogs.com/bilaisheng/p/10210917.html
